Attachment for grain-cleaning machines.



G. H. SCOTT. ATTAGHMENT POR GRAIN CLEANING MACHINES. APPLICATION rum) DEO.10, 1906.

918,095, Patented Apr. 13, 1909.

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G. H. SCOTT. ATTACHMENT FOR GRAIN CLEANING MACHINES.

APPLICATION IILED DEC. 10, 1906.

Patented Apr. 13, 1909.

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CHARLES H. SCOTT, OF MINNEAPOLIS, MINNESOTA.

ATTACHMENT FOR GRAIN-CLEANING MACHINES.

Specification of Letters Patent.

Patented April 13, 1909.

Application filed December 10, 1906. Serial No. 347,076.

T 0 all whom it may concern:

Be it known that 1, CHARLES H. Scorr, of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Attachments for Grain- Cleaning Machines, of which the following is a specification.

My invention relates to grain-cleaning machinery, and the object of the invention is to provide means for keeping the meshes of a sieve clear to facilitate the grain cleaning op eration.

A further object is to provide a means for cleaning the upper surface of a sieve with out damaging the meshes thereof.

My invention consists generally in a scraper o crating on the upper surfaceof the sieve anc arranged to keep it clean without interfering with the passage of the grain thereover.

In the accompanying drawings, forming part of this specification, Figure 1 is a plan vlew of a portion of a grain cleaning machine with my invention applied thereto. Fig. 2 isa partial side elevation of the same. Fig. 3 is a vertical sectional view showing the position of the scraper devices on the sieves. ig. 4 is a detail view showing the manner of mounting the scraper. Fig. 5 is a sectional view of the same.

In the drawing, 2 represents the frame of the machine and 3 a sieve mounted therein and upon which the grain to be cleaned is discharged. 1 make no claim to any particular form of machine or sieve as my invention is applicable to any style now in use, suitable modifications being made in the manner of mounting the device to adapt it to the different types of machines.

In Fig. 1, I have shown one form of mounting which consists in providing angle bars 4 secured to the frame of the machine and forming guides for frames 5 that are adapted to slide horizontally between them. These frames consist preferably of tubes threaded and secured together and having shoes 6 secured to the frame by set screws 7 or other suitable means to permit their adjustment on said frame so that it will run easily and smoothly between the guides. I have shown in Fig. 1 two sets of these frames arranged to move across the sieves, one set traveling in one direction while the other set is traveling in the other direction. A chain 8 or other flexible means connects the frames at one end, passing around anti-friction wheels 9. A similar chain is provided on the other side of the machine and a sprocket chain drive 10 is attached to said lastnamed chain and forms a driving means for the scraper frames. This driving device forms the subject matter of an application for United States Patent, filed September 27, 1904, No. 226,101, and requires no detailed description herein. Upon each frame 1 pro vide a series of hangers 11 loosely mounted between adjustable collars 12, and springs 13 are looped around said frames between said collars and said hanger and have one end arranged to bear on the lower portion of said hanger, one spring on one side and the other on the other, and the tension of these springs tends to hold the hanger in a vertical position, each spring yielding, however, to allow the hanger to be swung either forwardly or backwardly. Any other suitable form of spring for yieldingly retaining the hangers 1 1 used in place of those described.

Upon the lower end of the hanger 11 is a scraper 14 consisting preferably of a narrow, comparatively thin band of metal that is adapted to sweep over the upper surface of the screen and revent the chafi' and refuse material from odgin therein and keeping the meshes clean, whifie without in any way interfering with the movement of the grain thereon. The scraper as shown in the drawing is quite narrow so that in sweeping over the sieve the grain instead of being pushed along ahead of the scraper will flow back over its upper edge and the passage of the grain dowm over the sieve will ractically be uninterrupted. In case a nail or any piece of foreign material catches in the meshes of the sieve the yielding blade engaging the same will slip or ride over it without damaging the sieve, whereas if a rigidly mounted scraper should be employed and it came in contact with any foreign substance sticking in the sieve the meshes would be torn or damaged. The yielding character of my scraper, however, obviates all danger of damage to the sieve in this way.

I do not wish to be confined to any particular form of scraper employed as it is capable of many modifications. I prefer, however, the narrow thin blade shown, as I believe it will be more suitable than any other form for the pur ose.

It wil be understood, of course, that any number of these scrapers and blades may be in a substantially vertical position, may be used on a machine according to its size and the length of he sieves.v and hence l 1, not wish to be confined to the particular number or arrangement herein shown.

I claim as my invention:

1. The combination with a sieve, of a narv nation, with a sieve, of a series of scraper blades arranged edgewise on the surface of the sieve, and means for reciprocating said blades on said sieve, said blades allowing the free passage of the grain and being capable of yielding upon striking obstructions in the s eve.

4. In a grain cleaning machine, the combination with a reciprocating frame, of hangers loosely mounted thereon, springs carried v by said frame and engaging said hangers and yieldingly preventing movement of the same in either dIrection and narrow scraper blades carried by said hangers and adapted to sweep across the upper surface of the sieve the tops of said blades being sufficiently near the sieve to allow the grain to flow back thereover, substantially as described.

5 In a grain cleaning machine, the combination, with a sieve, of a scraper consisting of a comparatively narrow flat blade arranged to. reciprocate thereon and means for operating said scraper, the lower edge of the scraper bearing on said sieve and said scraper being yieldingly mounted, whereby it will ride over an obstruction in the sieve, without breaking the meshes thereof.

6. n1 grain cleaning machine, the combs nation with the sieves, of reciprocating frames and means for guiding the same, and comparatively narrow scrapers carried by said frame and adapted to sweep across the surfaces of said sieves and said scrapers being yieldingly mounted on said frames, whereby independent movement of each of said scrapers to accommodate itself to an obstruction on the sieve, is permitted,- for the purpose specified.

7. ln a grain-cleaning machine, the combi nation, with a sieve, of a frame slidably mounted above the same, arms depending from said frame and arranged to oscillate forward and back thereon, means for yieldingly resisting the oscillation of said arms, and scraper blades carried by said arms and arranged to sweep over said sieve and through the grain thereon, substantially as described.

8. The combination, with a sieve, of oscillating arms and means supporting the same, means for yieldingly resisting the oscillation of said arms forward and back, and narrow metallic blades carried by said arms and arranged to sweep over said sieve and through the grain thereon, substantially as described.

9. In a grain cleaning machine, the combi nation, with a sieve, of a frame arranged to reciprocate above the same, hangers yieldingly mounted on said frame and narrow scrapers carried by said hangers and ar' ranged to bear on the sieve, said scrapers being capable of yielding horizontally with said hangers upon striking an obstruction in the sieve, and the upper edges of the scrapers be ing close to the surface of the sieve, whereby the grain will flow back thereover instead of being pushed ahead. of the scrapers, substantially as described.

In witness whereof, I have hereunto set my hand this 5th day of December 1906.

CHARLES H. SCOTT. 'Witnesses RICHARD PAUL, J. B. ERA. 

